when i bought a long tube race header for my neon i noticed a huge difference in the response and the way it pulled through 2nd 3rd and 4th. it was well worth the money i paid for that but i am doubting that it would be to noticeable on a truck. especially since your not racing around in it with your foot to the floor. i would say that its probably a waste of money. maybe put that 500 toward a nice lift, some new tires, or a stereo or something. or maybe pay on a credit card thats looming over your head. haha.